Richard P. Mattocks

Profit from 20 years commercial experience with over 100 digestion systems.

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Is a Digester suitable for You? 
Self Screening Assessment Form

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Richard Mattocks, ENVIRONOMICS
http://waste2profits.com | rpm@waste2profits.com
Tel: 917 359.5616
 

Work completed with financial assistance of Agricultural Utilization  Research Institute, Waseca, MN

Is a Digester suitable for you? Useful Form:
to Evaluate the Likelihood of Heated Manure Digestion System Success

Key Issues

YES/NO

Site Permanency

Projected facility life is less than 10 years

 

Bedding

Sand (dairy)

 

Confinement

Dairy: animals on pastured or on drylots more than 10% of the time

 

Hogs:  “all in-all out”

 

Storage

Storage and collection pit the same

 

Manure removal

Flush

 

Site Development Limitations

Problem finding 150X150 area for system

 

Water managed

No water meter or meter is unread

 

Rainwater comes in

 

Dairy: parlor holding area hosed down, not scraped*

 

Parlor tankroom water flows to manure pit*

 

Management

Is there question who will be incharge

 

Problem finding a good Farm Mechanic or service company

 

NOTE: Any “YES” in the above list is an area which may require costly changes that reduce likelihood of system success.  
*
Is the producer willing to make necessary changes?

 

Weighted Issues   

(Select the best description, place corresponding Weight value in the Selection column, add Selection values, compare with guideline Interpretation below)

 

Weight

 

Selection

Why install a Digester?

“A good idea”

1

 

Environmental Concerns

3

 

Financial benefit

6

 

 

Holsteins

Farrow/ Finish

Farrow/Wean

Finish

 

 

Animal numbers

< 300

<500

<1000

<3000

1

 

300-500

500-1000

1000-2500

3000-5000

3

 

500-1000

1000-1500

2500-5000

5000-10000

6

 

>1000

>1500

>5000

>10000

8

 

Electric rate,

<$0.05

1

 

Actual/ kWh

$0.05-0.06

3

 

charge

$0.06-0.07

6

 

>$0.07

8

 

Floor heating

In use in the production areas (and parlor holding area)

10

 

Fuel rate, average

<$0.50/gal Propane

<$3.00/1000 CuFt Natural gas

1

 

$0.50-$0.75/gal Propane

$3.00-$4.00/CuFt Natural gas

2

 

$0.75-$1.00/gal Propane

$4.00-$5.00/CuFt Natural gas

4

 

>$1.00/gal Propane

>$5.00/CuFt Natural Gas

6

 

Use 

No

0

 

depreciation on taxes

Partial

3

 

Entirely

8

 

Score

 

Interpretation:  0-20 = success questionable, 21-35= success possible,  35-46= greatest chance of success

NOTICE: This checklist is intended to highlight issues which may impact digester success and is not intended to be used as a final decision making tool; experienced professionals should be consulted for thorough evaluation before making final decisions  

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Richard Mattocks, ENVIRONOMICS LLC
http://waste2profits.com | Electronic-Mail
2517 Rte. 44, 11-221, Salt Point, NY 12578
Tel: 917 359.5616
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